There was exactly 1 code change: in L_1bf50 (nn::audio::server::InfoUpdater::UpdateMixes), code was added for setting a certain variable to 0x1, located immediately before the following already existing code: if(someval)aforementioned_variable |= somefunc(...);

This appears to be a simple bugfix to correct changes introduced in 6.0.0 to the value of IsSplitterSupported.